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Structure of the Lithosphere and Upper Mantle in den Ocean-Continent Transition from SS Precursors

SS前体在大洋-大陆转变过程中岩石圈和上地幔的结构

基本信息

批准号：
48083649
负责人：
Dr. Xiaohui Yuan
金额：
--
依托单位：
Sektion 2.4: Seismologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2007
资助国家：
德国
起止时间：
2006-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/48083649?language=en
关键词：
Structure Lithosphere Upper Mantle den

项目摘要

We propose to use the large amount of seismic data recorded by the GRSN and Gräfenberg stations to study the lithosphere and mantle transition zone in the continent-ocean transition with SS precursors. SS bounce points from events in the seismically very active region of the southwest Pacific sample a corridor from the Aleutians, Kamchatka and the Japan subduction zone through the North China craton to the Tibetan plateau. The corridor passes different tectonic units such as subduction zones, an old continental shield, a fold belt and a high plateau. We will investigate the lithosphere and the mantle transition beneath different geologic units along the corridor and infer geodynamic processes at depth. We will search for higher resolution evidence for the earlier proposed structural differences between continents and oceans down to the mantle transition zone. High resolution images of SS precursors may also reveal the interaction of the subducted oceanic lithosphere with the mantle transition and serve to answer the often debated question about the scale and extent of the slab stagnation within the mantle transition zone beneath the NW Pacific subduction zone. We will attempt to use the short period content of SS waveform data and experiment with methods like CMP stack and migration techniques to acquire high resolution lithosphere and upper mantle images and to improve the lateral and depth resolution for the upper mantle discontinuities and, further more, to create new possibilities to study the shallower structures such as the lithosphere-asthenosphere boundary with SS precursors.

我们建议利用GRSN和Gräfenberg台站记录的大量地震资料，用SS前兆研究大陆-海洋过渡带的岩石圈和地幔过渡带。来自西南太平洋地震活跃区的事件的SS反弹点采样了从阿留申群岛、堪察加半岛和日本俯冲带通过华北克拉通到青藏高原的走廊。该走廊经过不同的构造单元，如俯冲带，旧大陆盾，褶皱带和高原。我们将调查岩石圈和地幔过渡下不同的地质单元沿着走廊和推断地球动力学过程在深度。我们将寻找更高分辨率的证据，为早先提出的大陆和海洋之间的地幔过渡带的结构差异。SS前体的高分辨率图像也可以揭示俯冲的海洋岩石圈与地幔过渡的相互作用，并有助于回答经常争论的问题的规模和范围内的板片停滞的地幔过渡带下的西北太平洋俯冲带。我们将尝试利用SS波形数据的短周期内容，通过CMP叠加和偏移技术等方法获得高分辨率的岩石圈和上地幔图像，提高上地幔不连续面的横向和深度分辨率，并为研究岩石圈-软流圈边界等浅部结构和SS前兆创造新的可能性。